CN107925859B - Terminal device, base station device, measurement method, and electric circuit - Google Patents

Abstract

The invention provides a terminal device, a base station device, a communication system, a measurement method and an integrated circuit capable of efficiently performing side-link direct connection discovery. In a terminal device, a receiving unit receives an RRC connection reconfiguration message including a first setting relating to sidelink direct connection discovery, and when the first setting includes frequency information, a timer for counting a predetermined time is used, and during counting of the timer, the receiving unit attempts to acquire system information broadcasted on a frequency, in relation to setting information relating to monitoring of sidelink direct connection discovery announcements in the frequency indicated by the frequency information.

Description

Terminal device, base station device, measurement method, and electric circuit

Technical Field

Embodiments of the present invention relate to a terminal device, a base station device, a communication system, a measurement method, and an integrated circuit technology for performing side link direct discovery.

Background

In 3GPP (3rd Generation Partnership Project) which is a standardization Project, standardization of EUTRA (Evolved Universal Terrestrial Radio Access) that realizes high-speed communication is performed by using a communication scheme called OFDM (Orthogonal Frequency-Division Multiplexing) and flexible scheduling of a resource block in a predetermined Frequency/time unit. EUTRA is sometimes also referred to as LTE (Long Term Evolution).

Further, in 3GPP, Advanced EUTRA (also referred to as LTE-a) that realizes higher-speed data transmission and has upward compatibility with EUTRA is being studied.

In Advanced EUTRA, introduction of direct communication (Device to Device: D2D) between terminal devices is being studied. In D2D, as a service (Proximity based Services: ProSe) between terminal devices that are close to each other, a configuration (also referred to as ProSe Direct, D2D, Sidelink Direct Discovery) for confirming (discovering) whether or not the terminal devices are located in the vicinity of each other, a configuration (also referred to as ProSe Communication, ProSe Direct Communication, D2D Communication, D2D Direct Communication, Sidelink Direct Communication) for causing the terminal devices to perform data Communication without the base station device therebetween, and the like are specified (non-patent document 1), and further functional extensions are being studied.

For example, a configuration for enabling transmission (Side Link Direct Discovery Announcement) or reception (Side Link Direct Discovery Monitoring) of Side Link Direct Discovery even in a Network out of coverage, or other frequencies, or other Public Mobile Network (PLMN), and a configuration for enabling a Network coverage or a terminal device out of coverage to connect to a Network via communication based on D2D with a terminal device in the Network coverage, and the like are being studied (non-patent documents 2 and 3).

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.300 V12.6.0(2015-7) http: Hwww.3gpp.org/DynaReport/36300. htm

Non-patent document 2: RP-150441, Qualcomm, Revised WI: enhanced LTE Device to Device Proximity Services http: // www.3gpp.org/ftp/TSG _ RAN/TSG _ RAN/TSGR _67/Docs/RP-150441.zip

Non-patent document 3: r2-152682, Interdigital, On ProSe Discovery for inter-carrier and inter-PLMN http: // www.3gpp.org/ftp/tsg _ ran/WG2_ RL2/TSGR2_90/Docs/R2-152682.zip

Non-patent document 4: 3GPP TS 36.331 V12.6.0(2015-7) http: Hwww.3gpp.org/DynaReport/36331. htm

Disclosure of Invention

Problems to be solved by the invention

Non-patent document 3 describes the following: the terminal device needs a period (interval) in which normal communication is interrupted in order to transmit and receive the sidelink direct connection discovery in another frequency or a public mobile phone network, and notifies the base station device of the resource of the sidelink direct connection discovery in order to generate the interval. However, there is neither disclosure nor suggestion about a specific method of acquiring resources for sideline direct discovery or notification.

Embodiments of the present invention have been made in view of the above problems, and an object of the present invention is to solve the above problems by providing a technique relating to a terminal device, a base station device, a communication system, a measurement method, and an integrated circuit that can efficiently perform side link direct discovery.

Technical scheme

In order to achieve the above purpose, the following scheme is adopted. That is, a terminal device according to an embodiment of the present invention is a terminal device in which a receiving unit receives an RRC connection reconfiguration message including a first setting related to sidelink direct connection discovery, and when the first setting includes frequency information, a timer for counting a predetermined time is used, and during counting of the timer, acquisition is performed by acquiring system information broadcasted from the frequency, while attempting to count setting information related to monitoring of a sidelink direct connection discovery announcement in a frequency indicated by the frequency information.

In addition, a base station device according to an embodiment of the present invention is a base station device that communicates with a terminal device, wherein a transmission unit transmits an RRC connection reconfiguration message including a first setting for sidelink direct connection discovery by including frequency information in the first setting, and the terminal device uses a timer that counts a predetermined time, and acquires, from system information broadcasted from the frequency, setting information related to monitoring of a sidelink direct connection discovery announcement in a frequency indicated by the frequency information during the counting of the timer.

A communication system according to an embodiment of the present invention is a communication system in which a terminal device communicates with a base station device, the base station device transmits an RRC connection reconfiguration message including a first setting related to a sidelink direct connection discovery, the terminal device receives the RRC connection reconfiguration message including the first setting, and when the first setting includes frequency information, the terminal device uses a timer that times a predetermined time, and attempts to acquire, by acquiring system information broadcast on the frequency, setting information related to monitoring of a sidelink direct connection discovery announcement in a frequency indicated by the frequency information during the time counting of the timer.

A terminal device measurement method according to an embodiment of the present invention is a measurement method applied to a terminal device, and includes at least the steps of: a step in which a reception unit receives an RRC connection reconfiguration message including a first setting relating to sidelink direct connection discovery; and a step of acquiring system information broadcast on the frequency by using a timer for counting a predetermined time when the first setting includes the frequency information, and attempting to acquire setting information related to monitoring of a side link direct connection discovery advertisement in a frequency indicated by the frequency information during the counting of the timer.

Further, an integrated circuit mounted on a terminal device according to an embodiment of the present invention is an integrated circuit mounted on a terminal device, and causes the terminal device to function as: the reception unit receives an RRC connection reconfiguration message including a first setting related to sidelink direct connection discovery, and when the first setting includes frequency information, uses a timer for counting a predetermined time, and attempts to acquire, by acquiring system information broadcasted on the frequency, setting information related to monitoring of sidelink direct connection discovery announcement in a frequency indicated by the frequency information during counting of the timer.

Effects of the invention

As described above, according to the embodiments of the present invention, it is possible to provide a technique relating to a terminal device, a base station device, a communication system, a measurement method, and an integrated circuit that can efficiently perform side link direct discovery.

Drawings

Fig. 1 is a block diagram showing an example of a schematic configuration of a terminal device according to an embodiment of the present invention.

Fig. 2 is a block diagram showing an example of a schematic configuration of a base station apparatus according to an embodiment of the present invention.

Fig. 3 is a diagram showing an example of a process for performing the side link direct discovery advertisement monitoring according to the embodiment of the present invention.

Fig. 4 is a diagram showing a User-Plane (U-Plane) protocol stack according to an embodiment of the present invention.

Fig. 5 is a diagram showing a Control-Plane (CP (C-Plane)) protocol stack according to an embodiment of the present invention.

Fig. 6 is a sequence diagram showing an example of a conventional RRM measurement setting management procedure.

Fig. 7 is a diagram showing an example of conventional RRM measurement setting.

Detailed Description

In the present specification, although the techniques related to the terminal device, the base station device, the communication system, the measurement method, and the integrated circuit capable of efficiently performing the side-link direct discovery are disclosed in the respective embodiments, the communication method applicable to the respective embodiments is not limited to the communication method compatible with EUTRA such as EUTRA or Advanced EUTRA.

For example, the techniques described herein may be used in various communication systems that use Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), orthogonal FDMA (ofdma), signal carrier frequency division multiple access FDMA (SC-FDMA), and other access schemes. Further, in this specification, the system and the network may be equivalently used.

Hereinafter, the technique according to each embodiment of the present invention will be briefly described.

[ channels/signals ]

The lte (eutra) channel is composed of a logical channel, a transport channel, and a physical channel. The channel means a Medium for transmitting and receiving signals, and the logical channel defines the kind of data transmission service transmitted and received in a Medium Access Control (MAC) layer. The transmission channel defines the characteristics of the data transmitted over the radio interface and how this data is transmitted.

A physical channel means a physical medium carrying data forwarded to a physical layer through a transport channel. In one aspect of the invention, a physical channel may be used equivalently with a signal. In a communication system in which EUTRA (LTE, LTE-a) is developed, a new type of channel may be added, or the structure (configuration) or format thereof may be changed or added, but even in this case, the description of the embodiments of the present invention is not affected, and these channels may be used as channels used in the embodiments of the present invention.

In EUTRA, radio frames are used to manage the scheduling of physical channels or physical signals. One radio frame is 10ms, and one radio frame is composed of 10 subframes. Also, one subframe is composed of two slots (i.e., one subframe is 1ms and one slot is 0.5 ms). Further, as a minimum unit of scheduling for configuring a physical channel, management is performed using resource blocks. A resource block is defined by a fixed frequency domain consisting of a set of a plurality of subcarriers (for example, 12 subcarriers) on the frequency axis and a region consisting of a fixed transmission time interval (one slot).

The downlink of EUTRA is explained. The downlink logical channels include broadcast Control channel bcch (broadcast Control channel), paging Control channel pcch (paging Control channel), common Control channel ccch (common Control channel), dedicated Control channel dcch (dedicated Control channel), and dedicated Traffic channel dtch (dedicated Traffic channel).

The broadcast control channel BCCH is a logical channel for broadcasting (broadcast) system information. The paging control channel PCCH is a logical channel for transmitting paging information, and is used when a network calls a terminal device or notifies a system information update. The common Control channel CCCH is a logical channel for transmitting Control information between the terminal apparatus and the network, and is used by the base station apparatus in the downlink when the state of the terminal apparatus does not transition to a state (RRC CONNECTED state) in which Radio Resource Control (RRC) connection is performed with the network.

The dedicated control channel DCCH is a point-to-point (point-to-point) bidirectional channel and is a logical channel for transmitting dedicated control information between the terminal apparatus and the network. The dedicated control channel DCCH can be used between the terminal device in the RRC connected state and the base station device. The dedicated traffic channel DTCH is a one-to-one bidirectional channel, is a channel dedicated to a certain terminal device, and is a logical channel for forwarding (transmitting) user information (unicast data).

The downlink transport channels include broadcast channel bch (broadcast channel), paging channel pch (paging channel), and downlink Shared channel DL-sch (downlink Shared channel).

The broadcast channel BCH broadcasts to all cells by means of a fixed and predefined format (Transport format). The downlink shared channel DL-SCH supports HARQ (Hybrid Automatic Repeat Request), dynamic adaptive modulation (link adaptation) control, dynamic or quasi-static resource allocation, and Discontinuous Reception (DRX). In addition, a paging channel PCH is broadcast to all cells.

A physical channel and a physical signal of the downlink of EUTRA will be described.

Synchronization Signals (Synchronization Signals) are composed of 3 kinds of Primary Synchronization Signals (PSS) and a secondary Synchronization signal composed of 31 kinds of codes configured differently from each other in the frequency domain, and 504 kinds of Cell identifiers (Physical Cell Identity: PCI) for identifying a base station apparatus and frame timing for wireless Synchronization are indicated by signal combination of the primary Synchronization Signals and the secondary Synchronization Signals. The terminal apparatus specifies a physical cell ID of a synchronization signal received by cell search.

Downlink Reference signals (Downlink Reference Signal) are classified into a plurality of types according to their uses. For example, a Cell-specific RS (CRS) is a pilot signal transmitted with a predetermined power in a Cell, and is a downlink reference signal periodically repeated in a frequency domain and a time domain based on a predetermined rule. The terminal device can measure the reception quality of each cell by receiving the cell-specific RS. The terminal device can also use the cell-specific RS as a reference signal for demodulation of a physical downlink control channel or a physical downlink shared channel transmitted together with the cell-specific RS.

The sequence used in the cell-specific RS uses a sequence that can be identified by cell. The cell-specific RS may be transmitted by the base station apparatus in all downlink subframes, or may be transmitted only in a downlink subframe designated by the base station apparatus. The terminal device may receive the cell-specific RS in all downlink subframes, or may receive the RS only in a downlink subframe designated by the base station device.

In addition, the downlink reference signal is also used to estimate the downlink propagation path variation. The downlink Reference signal used to estimate the propagation path variation is referred to as a Channel State Information Reference signal (CSI-RS, CSI Reference signal). In addition, the CSI reference signal may be transmitted with substantially no signal or zero power. On the other hand, the CSI-RS that actually transmits the signal may also be referred to as a Non-Zero Power Channel State Information references (NZP CSI-RS). In addition, a radio Resource of a downlink for measuring an Interference component may be referred to as a Channel State Information Interference Measurement Resource (CSI-IMR) or a CSI-IM Resource.

The downlink Reference Signal individually set in the terminal device is referred to as a UE specific Reference Signal (URS) and a Demodulation Reference Signal (DMRS), and is referred to for channel propagation path compensation processing when demodulating a physical downlink control channel, an extended physical downlink control channel, or a physical downlink shared channel.

A Physical Broadcast Channel (PBCH) is transmitted for the purpose of notifying (setting) a Master Information Block (MIB) commonly used by terminal apparatuses in a cell. The base station apparatus notifies (transmits) a master information block message containing the MIB through a physical broadcast channel. The information notified from the MIB, which is information notified (set) to the terminal apparatus by the master information block message, includes a downlink frequency bandwidth, a system frame number, and setting information (configuration) of a physical channel (PHICH) associated with Hybrid ARQ.

The base station apparatus transmits cell common information other than the main information block to the terminal apparatus using a System information block Type 1(SIB 1: System information block Type1) message that statically determines a subframe position and a period (pre-defined), and other types of System information messages (e.g., System information block Type 2 to Type n (n is a natural number)) that are dynamically scheduled within a System information window (SI-window) and are specified by the System information block Type 1.

Here, the master information block message, the system information block type1 message, and the system information message are respectively third layer messages (RRC messages). In the present specification, the system information (broadcast information) may mean the RRC message or information (information element) notified by the master information block and each system information block.

The system information message is notified using a physical downlink shared channel in the radio resource indicated by the physical downlink control channel, and one of the system information (system information block types 2 to n (SIB2 to SIBn (n is a natural number))) classified according to its use is transmitted within the corresponding system information window.

A Cell Global Identifier (CGI) indicating an individual Identifier of a Cell, a Tracking Area Identifier (TAI) managing a standby Area obtained by paging, random access setting (common random access setting) information, timing adjustment information, common radio resource setting information for each Cell, neighbor Cell list information (neighbor Cell list) of the same frequency (different frequency, different RAT), uplink access restriction information, resource information discovered by sidelink direct connection, resource information of sidelink direct connection communication, and the like are notified as system information.

A Physical Downlink Control Channel (PDCCH) is transmitted from a start point of each subframe by a number of OFDM symbols (e.g., 1 to 4OFDM symbols). An Extended Physical Downlink Control Channel (EPDCCH) is a Physical Downlink Control Channel (pdcch) allocated to an OFDM symbol in which a Physical Downlink Shared Channel (PDSCH) is allocated. The PDCCH or EPDCCH is used for the purpose of notifying the terminal apparatus of radio resource allocation information subjected to scheduling by the base station apparatus, control information indicating an adjustment amount for increasing or decreasing transmission power, and the like. Hereinafter, in the case where only a Physical Downlink Control Channel (PDCCH) is described, physical channels of both sides of PDCCH and EPDCCH are meant unless explicitly stated.

Before transmitting and receiving a second layer message (MAC-CE) and a third layer message (paging, system information, etc.), a terminal device needs to monitor (monitor) a physical downlink control channel addressed to the device itself, and receive the physical downlink control channel addressed to the device itself, thereby acquiring radio resource allocation information called an uplink grant at the time of transmission and called a downlink grant (also called a downlink assignment) at the time of reception from the physical downlink control channel. In addition to the OFDM symbol, the physical downlink control channel may be configured to be transmitted in a region of a resource block allocated (dedicated) from the base station apparatus to the terminal apparatus.

The Physical Downlink Shared Channel (PDSCH) is also used to notify the terminal apparatus of a third layer message such as paging or system information other than Downlink data. The radio resource allocation information of the physical downlink shared channel is indicated (notified) by the physical downlink control channel. The physical downlink shared channel is allocated to and transmitted from an OFDM symbol other than the OFDM symbol for transmitting the physical downlink control channel. That is, the physical downlink shared channel and the physical downlink control channel are time division multiplexed within one subframe.

The broadcast channel BCH is mapped to the physical broadcast channel PBCH. The paging channel PCH and the downlink shared channel DL-SCH are mapped to the physical downlink shared channel PDSCH. The physical downlink control channel PDCCH is used by a physical channel alone.

Further, in the downlink, a paging control channel PCCH is mapped to a paging channel PCH. The broadcast control channel BCCH is mapped to a broadcast channel BCH and a downlink shared channel DL-SCH. Common control channel CCCH, dedicated control channel DCCH, dedicated traffic channel DTCH are mapped to downlink shared channel DL-SCH.

Next, uplink of EUTRA will be described. The uplink logical channels include common Control channel (ccch), dedicated Control channel (dcch), and dedicated Traffic channel (dtch).

The common Control channel CCCH is a logical channel for transmitting Control information between the terminal device and the network, and is used by the terminal device when the state of the terminal device is not transferred to a state (RRC CONNECTED state, RRC _ CONNECTED) CONNECTED to Radio Resource Control (RRC) of the network (i.e., RRC IDLE state, RRC _ IDLE) in the uplink.

The dedicated control channel DCCH is a point-to-point (point-to-point) bidirectional channel and is a logical channel for transmitting individual control information between the terminal apparatus and the network. The dedicated control channel DCCH can be used between the terminal device in the RRC connected state and the base station device. The dedicated traffic channel DTCH is a one-to-one bidirectional channel, a channel dedicated to one terminal device, or a logical channel for forwarding user information (unicast data).

The uplink transport channels include an uplink Shared channel UL-sch (uplink Shared channel) and a random Access channel rach (random Access channel).

In the uplink shared channel UL-SCH, HARQ (Hybrid Automatic Repeat Request), dynamic adaptive modulation control, dynamic or quasi-static resource allocation, Discontinuous Transmission (DTX) are supported. In the random access channel RACH, limited (limited) control information is transmitted.

Physical channels and physical signals of the uplink of EUTRA will be described.

The Physical Uplink Control Channel (PUCCH) is used for receiving an Acknowledgement (ACK/NACK) of downlink data transmitted through the Physical downlink shared Channel, downlink propagation path (Channel State) Information (CSI), and an Uplink radio resource allocation Request (radio resource Request, Scheduling Request (SR)).

The Physical Uplink Shared Channel (PUSCH) mainly transmits Uplink data and Uplink control data, and may include control data such as CSI or ACK/NACK. Further, the present invention is also intended to notify the base station apparatus of uplink control information other than uplink data from the terminal apparatus as a layer two message and a layer three message. In addition, the radio resource allocation information of the physical uplink shared channel is represented by a physical downlink control channel, as in the downlink.

The Uplink Reference Signal (Uplink Reference Signal: Uplink Reference Signal (also referred to as Uplink pilot Signal, Uplink pilot channel)) includes a Demodulation Reference Signal (DMRS: Demodulation Reference Signal) for demodulating the physical Uplink control channel PUCCH and/or the physical Uplink shared channel PUSCH by the base station apparatus, and a Sounding Reference Signal (SRS: Sounding Reference Signal) for mainly estimating the channel state of the Uplink by the base station apparatus. Further, the sounding reference signal has a Periodic sounding reference signal (Periodic SRS) transmitted periodically and an Aperiodic sounding reference signal (Aperiodic SRS) transmitted when instructed from the base station apparatus.

A Physical Random Access Channel (PRACH) is a Channel for notifying (setting) a preamble sequence, and has a guard time. The preamble sequence is configured to notify the base station apparatus of information by a plurality of sequences. For example, when 64 kinds of sequences are prepared, 6-bit information can be indicated to the base station apparatus. The physical random access channel is used as an access scheme for the terminal apparatus to the base station apparatus.

The terminal apparatus uses a physical random access channel in order to request an uplink radio resource when a physical uplink control channel is not set, or in order to request Timing adjustment information (also referred to as Timing Advance (TA)) and the like necessary to match an uplink transmission Timing with a reception Timing window of the base station apparatus from the base station apparatus. Further, the base station apparatus can also request the start of the random access procedure to the terminal apparatus using the physical downlink control channel.

In the uplink, a common control channel CCCH, a dedicated control channel DCCH, a dedicated traffic channel DTCH are mapped to an uplink shared channel UL-SCH.

The uplink shared channel UL-SCH is mapped to the physical uplink shared channel PUSCH. The random access channel RACH is mapped to the physical random access channel PRACH. The physical uplink control channel PUCCH is used by the physical channel alone.

Next, a side link used for communication (direct communication, direct discovery, or the like) between terminals in EUTRA will be described. The logical channels of the sidelink include sidelink Broadcast channel sbcch (sidelink Broadcast Control channel) and sidelink Traffic channel stch (sidelink Traffic channel).

The sidelink broadcast channel SBCCH is a logical channel used to carry broadcast information in sidelink direct communication. The sidelink traffic channel is a channel for carrying user data in sidelink direct communication.

The transmission channels of the sidelink include sidelink Broadcast channel SL-bch (sidelink Broadcast channel), sidelink Discovery channel SL-dch (sidelink Discovery channel), and sidelink Shared channel SL-sch (sidelink Shared channel).

The side-link broadcast channel SL-BCH is broadcasted by the terminal apparatus to other terminal apparatuses in a pre-defined transport format. The sidelink discovery channel SL-DCH is a fixed and predefined format (fixed size, pre-defined transport format) that supports resource allocation by scheduling by the base station apparatus or resource selection by the terminal apparatus itself, and HARQ combining (HARQ combining). The side link shared channel SL-SCH supports resource allocation, HARQ combining (HARQ combining), and dynamic adaptive modulation (link adaptation) control, which are achieved by scheduling by the base station apparatus or resource selection by the terminal apparatus itself.

Physical channels and physical signals of the side link of EUTRA will be explained.

A Physical Sidelink Broadcast Channel (PSBCH) is used for a terminal apparatus to broadcast information related to system and synchronization.

The Physical Sidelink Discovery Channel (PSDCH) is used to carry a sidelink direct discovery message from the terminal device.

A Physical Sidelink Control Channel (PSCCH) is used to carry control information for sidelink direct communication from a terminal device.

A Physical sidelink shared channel (psch) is used to carry data for sidelink direct communication from a terminal device.

The physical side link control channel PSCCH is used to notify resources used in the physical side link shared channel PSCCH and other transmission parameters.

A Side link reference signal (Side reference signal) used for demodulation of the PSCCH, and pscsch has a similar structure to the DMRS of the uplink reference signal, and is arranged in a specific symbol of a slot in which each physical channel is arranged.

A Sidelink Synchronization Signal (SLSS) is used to synchronize with a terminal device outside the coverage of the network. The Sidelink Synchronization Signal is composed of two Synchronization signals, a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The primary side link synchronization signal can adopt 2 sequences, and the secondary side link synchronization signal can adopt 168 sequences, and 336 identifiers (slsid) can be represented by group transmission. The SLSSID has a value of 0 to 335, and a sidelink synchronization signal of 0 to 167 is used in the case where the sidelink synchronization signal is transmitted based on the synchronization timing of the base station apparatus, and a sidelink synchronization signal of 168 to 335 is used in the case where the synchronization timing of the base station apparatus is not based.

The other physical channels or physical signals are not related to the embodiments of the present invention, and therefore, detailed description thereof is omitted.

[ Wireless network ]

A communicable range (communication area) of each frequency controlled by the base station apparatus is regarded as a cell. In this case, the communication area covered by the base station apparatus may have different widths and different shapes for each frequency. Further, the covered area may also be different by frequency.

The terminal apparatus operates with the inside of the cell as a communication area. When a terminal device moves from a certain cell to another cell, the terminal device moves to another appropriate cell by a cell reselection procedure in a non-radio connection (also referred to as an IDLE state or an RRC _ IDLE state) or by a handover procedure in a radio connection (also referred to as a CONNECTED state or an RRC _ CONNECTED state). The suitable cell generally indicates a cell which has determined that access by the terminal apparatus is not prohibited and the downlink reception quality satisfies a predetermined condition based on information specified by the base station apparatus.

The base station apparatus manages cells, which are areas where the terminal apparatus can communicate, by frequency. One base station apparatus may manage a plurality of cells.

When a terminal apparatus can communicate with a certain base station apparatus, among cells of the base station apparatus, a cell set for communication with the terminal apparatus is called a Serving cell (Serving cell), and other cells not used for communication are called neighbor cells (neighbor cells).

[ Wireless protocol Structure ]

Fig. 4 is a diagram showing a User-Plane (UP-Plane, U-Plane) protocol stack for processing User data of a terminal apparatus and a base station apparatus in a radio network of EUTRA (EUTRAN). Fig. 5 is a diagram showing a Control-Plane (CP (C-Plane)) protocol stack for processing Control data.

In fig. 4 and 5, a Physical layer (PHY layer) provides a transport service to an upper layer by using a Physical Channel. The PHY layer is connected to a Medium Access Control layer (MAC layer) of an upper layer through a transport channel. Data moves between the MAC layer, the PHY layer, and the layer (layer) via transport channels. Data is transmitted and received between the PHY layers of the terminal apparatus and the base station apparatus via a physical channel.

The MAC layer maps various logical channels to various transport channels. The MAC layer is connected to a Radio Link Control layer (RLC layer) of an upper layer through a logical channel. The logical channels are roughly classified into control channels for transmitting control information and traffic channels for transmitting user information according to the type of information to be transmitted. The MAC layer has a function of controlling the PHY layer for discontinuous transmission and reception (DRX/DTX), a function of executing a random access procedure, a function of notifying information of transmission power, a function of performing HARQ control, and the like.

The RLC layer segments (Segmentation) and reassembles (termination) data received from an upper layer to adjust the data size so that a lower layer can properly transmit data. In addition, the RLC layer has a function of guaranteeing quality of service (qos) requested by each data. That is, the RLC layer has functions such as retransmission control of data.

The Packet Data Convergence Protocol layer (PDCP layer) has a header compression function for compressing unnecessary control information in order to efficiently transmit an IP Packet as user Data in a radio zone. In addition, the PDCP layer also has a ciphering function for data.

Also, the Control plane protocol stack has a Radio Resource Control layer (RRC layer). The RRC layer performs setting and resetting of Radio Bearers (RBs) and controls logical channels, transport channels, and physical channels. The RB is divided into a Signaling Radio Bearer (SRB) used as a path for transmitting an RRC message as control information and a Data Radio Bearer (DRB). The DRB is used as a path for transmitting user data. Each RB is set between the RRC layers of the base station apparatus and the terminal apparatus.

In a layered structure of a generally known Open Systems Interconnection (OSI) model, a PHY layer corresponds to a physical layer of a first layer, a MAC layer, an RLC layer, and a PDCP layer correspond to a data link layer which is a second layer of the OSI model, and an RRC layer corresponds to a network layer which is a third layer of the OSI model.

Further, a signaling protocol used between the network and the terminal device is divided into an Access Stratum (AS) protocol and a Non-Access Stratum (NAS) protocol. For example, the protocol below the RRC layer is an access stratum protocol used between the terminal device and the base station device. Protocols such as Connection Management (CM) and Mobility Management (MM) of the terminal device are non-access stratum protocols and are used between the terminal device and the Core Network (CN). For example, as shown in fig. 5, communication using a non-access stratum protocol is transparently performed between a terminal device and a Mobility Management Entity (MME) via a base station device.

[ random Access procedure ]

Hereinafter, a random access procedure will be described. The Random Access procedure has two Access procedures, a Contention based Random Access procedure (Contention based Random Access procedure) and a Non-Contention based Random Access procedure (Non-Contention based Random Access procedure).

The contention random access procedure is a random access procedure in which there is a possibility of collision between mobile station apparatuses, and is a scheduling request or the like in the case where a mobile station apparatus generates uplink data transmission in a state where uplink synchronization is disconnected, even when initial access is started from a state where the mobile station apparatus is not connected (communicating) with a base station apparatus or when the mobile station apparatus is connected to the base station apparatus.

The non-contention random access procedure is a random access procedure in which no collision occurs between mobile station apparatuses, and a base station apparatus and a mobile station apparatus are connected, but when uplink synchronization is disconnected, the base station apparatus instructs the mobile station apparatus to start the random access procedure when a special case such as handover or invalidation of transmission timing of the mobile station apparatus is encountered in order to quickly acquire uplink synchronization between the mobile station apparatus and the base station apparatus. The non-contention random access procedure is indicated by a message of an RRC (Radio Resource Control: Layer3) Layer and Control data of a physical downlink Control channel PDCCH.

[ MAC layer function ]

Hereinafter, the function of the MAC layer of the terminal device will be described. The MAC layer has a function of mapping each logical channel to a transport channel. Further, the function of generating transmission data from the logical channels in accordance with the priority is provided. This process is called Logical Channel Prioritization (LCP) process. The basic LCP procedure determines the transmission priority of transmission data in consideration of the priority of each logical channel and the transmission Bit Rate (Prioritized Bit Rate: PBR) that must be transmitted within a certain period of time corresponding to the QoS of a radio bearer, and generates transmission data from data having a high transmission priority at the time point of receiving an uplink grant. When connecting to the base station apparatus, the MAC layer acquires information such as the logical channel number, logical channel priority, and PBR of each RB from the RRC layer.

[ measurement ]

Radio Resource Management (RRM) measurement of EUTRA will be described.

Fig. 6 is a sequence diagram for explaining a radio resource management measurement setting management method for a terminal device and a base station device in EUTRA.

In the example of fig. 6, the base station apparatus can use two different frequencies F1 and F2 as the frequencies used by the base station apparatus, and the terminal apparatus and the base station apparatus are in a state in which a radio connection is established at frequency F1. Here, the base station apparatus transmits a message (measurement setting message) including measurement setting to the terminal apparatus in order to measure the reception quality of the cell (visiting cell) and the other cells (neighboring cells) in communication (step S601). The measurement setting (measurement configuration) message includes at least one measurement setting information for each of the frequencies (frequency F1 and frequency F2) to be measured. The measurement setting information includes a measurement ID, a measurement object (measurement object), a measurement object ID corresponding to the measurement object, report setting (reporting configuration) including trigger type (measurement Event (Event) information as a trigger of a report) or periodic (periodic) measurement information, and a report setting ID corresponding to the report setting. A plurality of report setting IDs may be linked to one measurement object ID. Similarly, a single report setting ID may be linked to a plurality of measurement object IDs.

For example, the following case will be described with reference to fig. 7: two measurement targets (frequency F1 and frequency F2) and three report settings are notified, and three measurement IDs are set for the combination of the measurement targets and the report settings.

As the measurement target, the base station apparatus assigns identifiers 0 and 1 to the frequency F1 and the frequency F2, respectively, as measurement target IDs and notifies the terminal apparatus of the measurement target IDs. In addition, as the report setting, the base station apparatus assigns identifiers 0, 1, and 2 to report setting 1, report setting 2, and report setting 3, respectively, as report setting IDs, and notifies the terminal apparatus of the report setting IDs. Then, the base station apparatus notifies the terminal apparatus of the measurement ID bound (linked) to the combination of the identifier of the measurement target and the identifier set in the report.

In fig. 7, a combination of the measurement target of the identifier 0 (frequency F1) and the report setting of the identifier 0 is designated as measurement ID # 0. Similarly, the combination of the measurement object of the identifier 0 (frequency F1) and the report setting of the identifier 1 is designated as measurement ID #1, and the combination of the measurement object of the identifier 0 (frequency F2) and the report setting of the identifier 2 is designated as measurement ID # 2.

The measurement event information includes, for example: information including a measurement event indicating a condition such as when the reception quality of the cell-specific reference signal of the visiting cell is lower than or higher than a predetermined threshold value, or when the reception quality of the cell-specific reference signal of the neighboring cell is lower than the visiting cell, or when the reception quality of the neighboring cell is higher than a predetermined threshold value, and a parameter for determining the condition. The parameters include information such as a threshold value, a compensation value, and a time required to establish a measurement event. In non-patent document 4, for example, as the measurement event a4, the following is defined: the measurement report is triggered (trigger) when the reception quality of the neighboring cell becomes better than a threshold (enter) (or even far away from this situation (leave)).

The periodic measurement information includes the purpose of measurement, and for example, notifies the terminal device of the following: the measurement is performed for reporting the cell with the highest received power, the measurement is performed for acquiring the cell global identifier included in the system information broadcasted by the cell of the frequency to be measured, and the like. In the case of measurement for acquiring a cell global identifier, the measurement target also includes information of which cell's cell global identifier is acquired. In addition, in the case of measurement for acquiring a cell global identifier, the value of a timer (for example, T321) for measurement is set based on a Radio Access Technology (RAT) or a multiplexing method, etc. as a target, and the counting of the timer is started. When the timer expires (expire) or when the measurement is completed before the timer expires, a measurement report is triggered (trigger).

In step S602, the terminal device stores (holds) the measurement setting information set by the base station device as internal information and then starts measurement processing. Specifically, as described above, the terminal device associates and manages the measurement ID, the measurement object ID, and the report setting ID in a single link, and starts measurement based on the measurement information corresponding to each ID. When the three IDs are linked to one, the correlation measurement is considered valid and started, and when the three IDs are not linked to one (when none of the IDs is set), the correlation measurement is considered invalid and not started. When the measurement setting information can be accurately set, the terminal device transmits a message (measurement setting completion message) indicating that the measurement setting is completed to the base station device in step S603.

When either the set measurement event or the periodic measurement satisfies the condition based on the parameter, the terminal device triggers (trigger) a measurement report and transmits a measurement report message to the base station device (step S604).

In the following, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings while taking the above matters into consideration. In the description of the embodiments of the present invention, well-known functions and configurations related to the embodiments of the present invention are specifically described, but when it is judged that the gist of the embodiments of the present invention is unclear, the detailed description thereof is omitted.

< first embodiment >

A first embodiment of the present invention will be explained below.

Fig. 1 is a block diagram showing an example of a terminal device 1 according to a first embodiment of the present invention. The terminal apparatus 1 includes at least a reception unit 101, a demodulation unit 102, a decoding unit 103, a reception data control unit 104, a physical layer control unit 105, a transmission data control unit 106, an encoding unit 107, a modulation unit 108, a transmission unit 109, a radio resource control unit 110, and a measurement unit 111. The "section" in the drawings refers to an element that realizes the function of the terminal apparatus 1 and each process expressed by terms of a component, a circuit, a constituent device, an apparatus, a unit, and the like.

The radio Resource controller 110 is a block for executing each function of an rrc (radio Resource control) layer for controlling the radio Resource of the terminal apparatus 1. The reception Data control unit 104 and the transmission Data control unit 106 are blocks for executing each function of a mac (medium Access control) layer, an rlc (radio Link control) layer, and a pdcp (packet Data conversion protocol) layer, which manage a Data Link layer.

The terminal device 1 may be configured as follows: in order to support transmission/reception processing performed in the same subframe of a plurality of frequencies (frequency bands, frequency bandwidths) or cells obtained by carrier aggregation and/or D2D, a plurality of blocks of a reception system (the reception unit 101, the demodulation unit 102, and the decoding unit 103) and some or all of blocks of a transmission system (the encoding unit 107, the modulation unit 108, and the transmission unit 109) are provided.

In the reception process of the terminal apparatus 1, the radio resource control unit 110 inputs the reception data control information to the reception data control unit 104, and the radio resource control unit 110 inputs the physical layer control information as a control parameter for controlling each block to the physical layer control unit 105. The physical layer control information is information including parameter settings necessary for controlling wireless communication of the terminal apparatus 1 configured by the reception control information and the transmission control information.

The physical layer control information is set by radio connection resource setting, cell-specific broadcast information, or system parameters, which are transmitted from the base station apparatus 2 to the terminal apparatus 1 individually (dedicated), and is output to the physical layer control unit 105 by the radio resource control unit 110 as necessary. The physical layer control unit 105 appropriately outputs reception control information, which is control information related to reception, to the reception unit 101, the demodulation unit 102, and the decoding unit 103.

The reception control information includes information on a reception frequency band, reception timing related to a physical channel and a physical signal, a multiplexing method, radio resource control information, and the like as downlink scheduling information. The received Data control information is downlink control information including DRX control information, Multicast Data (Multicast Data) reception information, downlink retransmission control information, and the like, and includes downlink-related control information for each of the MAC layer, the RLC layer, and the PDCP layer.

The reception signal is received by the reception unit 101. The reception unit 101 receives a signal from the base station apparatus 2 based on the frequency and frequency band notified by the reception control information. The received signal is output to the demodulation unit 102. The synchronization signal and the reference signal received by the receiving unit 101 are output to the measuring unit 111. The demodulation unit 102 demodulates the signal. The demodulation unit 102 outputs the demodulated signal to the decoding unit 103. The decoding unit 103 decodes the input signal, and outputs each decoded data (downlink data and downlink control data, also referred to as a downlink transport block) to the reception data control unit 104. The MAC control element transmitted together with each data from the base station apparatus 2 is also decoded by the decoding unit 103, and the relevant data is output to the received data control unit 104.

The received data control unit 104 performs control of the physical layer control unit 105 based on the received MAC control element (e.g., cell active/inactive, DRX control, transmission timing adjustment, and the like), buffering of each decoded data, and error correction control (HARQ) of retransmitted data. Each data and the related data input to the reception data control unit 104 are output (transferred) to the radio resource control unit 110 and/or the measurement unit 111.

The measurement unit 111 measures reception power or reception quality using the synchronization signal and the reference signal input from the reception unit 101 based on parameters (for example, a measurement target, report setting, and the like) necessary for measurement input from the radio resource control unit 110, and determines whether or not a condition for triggering a measurement report is satisfied. In addition, in the case where the purpose is to acquire system information related to side-chain direct link discovery by measurement, the measurement section 111 may operate as follows: system information related to the sidelink direct connection discovery is acquired from the data input from the received data control unit 104, and the acquired system information is included in the measurement report.

Further, as the synchronization signal input from the receiving unit 101, the measuring unit 111 can measure not only the synchronization signal transmitted from the base station apparatus 2 but also a synchronization signal (SLSS) transmitted from another terminal apparatus 1 that performs the side link direct discovery announcement.

Further, the measurement unit 111 may operate as follows: in the case where the purpose is to acquire system information related to the side link direct connection discovery by measurement, when a cell cannot be detected at a time point when the measurement of a timer set to a predetermined value is terminated or when system information related to the side link direct connection discovery cannot be acquired, information related to the side link direct connection discovery set in advance in the terminal device 1 is included in the measurement report.

In the transmission processing of the terminal apparatus 1, the radio resource control unit 110 inputs transmission data control information to the transmission data control unit 106, and the radio resource control unit 110 inputs physical layer control information as a control parameter for controlling each block to the physical layer control unit 105. The physical layer control unit 105 outputs transmission control information, which is control information related to transmission, to the encoding unit 107, the modulation unit 108, and the transmission unit 109 as appropriate. The transmission control information includes information such as coding information, modulation information, information on a transmission band, transmission timing related to a physical channel and a physical signal, a multiplexing method, and radio resource allocation information, and is used as uplink scheduling information.

The transmission data control information is uplink control information including DTX control information, random access setting information, uplink shared channel information, logical channel priority information, resource request setting information, cell group information, uplink retransmission control information, and a buffer status report. The radio resource controller 110 may set a plurality of pieces of random access configuration information corresponding to a plurality of cells, respectively, in the transmission data controller 106.

The radio resource control unit 110 manages transmission timing adjustment information and a transmission timing timer used for adjusting uplink transmission timing, and manages a state of uplink transmission timing (transmission timing adjustment state or transmission timing non-adjustment state) for each cell (or for each cell group or TA group). The transmission timing adjustment information and the transmission timing timer are included in the transmission data control information.

The transmission data (also referred to as uplink data, uplink control data, and uplink transport block) generated in the terminal apparatus 1 is input to the transmission data control unit 106 from the radio resource control unit 110 at an arbitrary timing. At this time, the transmission data control unit 106 calculates the amount of transmission data (uplink buffer amount) to be input. The transmission data control unit 106 also has a function of determining whether the input transmission data belongs to the control plane or the user plane.

When transmission data is input, the transmission data control unit 106 stores the transmission data in an uplink buffer (not shown) in the transmission data control unit 106. The transmission data control unit 106 multiplexes and assembles the transmission data stored in the uplink buffer, based on the priority of the transmission data, and generates a MAC PDU. Then, the transmission data control unit 106 determines whether or not the radio resource necessary for transmission of the input transmission data is allocated to the terminal apparatus 1. The transmission data control unit 106 selects any one of a physical uplink shared channel PUSCH, a radio resource request using a physical uplink control channel (SR-PUCCH), and a radio resource request using a physical random access channel based on radio resource allocation, and requests the physical layer control unit 105 for control processing for transmitting the selected channel.

The transmission data control unit 106 also generates a buffer status report based on whether the input transmission data is transmission data for the base station apparatus 2 or transmission data for inter-device data communication. The encoding unit 107 appropriately encodes each data based on the transmission control information and outputs the encoded data to the modulation unit 108.

The modulation unit 108 performs appropriate modulation processing based on the channel structure of each data after transmission coding. The transmission unit 109 maps each data after modulation processing to the frequency domain, converts the frequency domain signal into a time domain signal, and applies the signal to a carrier wave of a predetermined frequency to perform power amplification. The transmitter 109 also adjusts the uplink transmission timing based on the transmission timing adjustment information for each cell (or for each cell group or for each TA group) input from the radio resource controller 110. The physical uplink shared channel on which the uplink control data is allocated may include, for example, a third layer message (radio resource control message, RRC message) in addition to the user data.

Further, in the case where the setting is made such that the side link direct discovery advertisement and/or the side link direct discovery advertisement monitoring is started (or stopped) from the upper layer, the radio resource controller 110 may operate as follows: side link terminal information of an RRC message includes, for example, information indicating that side link direct discovery advertisement and/or side link direct discovery advertisement monitoring is performed (interested) or stopped (not interested), frequency or PLMN information of the side link direct discovery, and information indicating that an interval is required for side link direct discovery advertisement and/or side link direct discovery advertisement monitoring in the frequency.

The "required interval" refers to, for example, the following cases: (1) in the normal operation of the terminal, the monitoring of the sidelink direct connection discovery announcement (and/or the acquisition of system information related to the sidelink direct connection discovery announcement monitoring) cannot be performed; (2) a situation in which the side link direct connection discovery advertisement monitoring (and/or the acquisition of system information related to the side link direct connection discovery advertisement monitoring) affects the work (operation) of a general terminal; (3) and when there is no gap, the sidelink direct connection discovery advertisement monitoring (and/or acquisition of system information related to the sidelink direct discovery advertisement monitoring) cannot be performed.

In fig. 1, the components of the other terminal apparatus 1 and the transmission path of data (control information) between the components are omitted, but it is obvious that a plurality of blocks having other functions necessary for operating the terminal apparatus 1 are provided as the components. For example, a NAS layer part and an application layer part that perform control with the core network exist above the radio resource control part 110.

Fig. 2 is a block diagram showing an example of the base station apparatus 2 according to the first embodiment of the present invention. The base station apparatus 2 is configured by at least a reception unit 201, a demodulation unit 202, a decoding unit 203, a reception data control unit 204, a physical layer control unit 205, a transmission data control unit 206, an encoding unit 207, a modulation unit 208, a transmission unit 209, a radio resource control unit 210, and a network signal transmission/reception unit 211. The "section" in the drawing is an element that can also be expressed by terms of components, circuits, constituent devices, units, and the like, and executes the function of the base station apparatus 2 and each process.

The radio Resource controller 210 is a block for executing each function of an rrc (radio Resource control) layer for controlling the radio Resource of the base station apparatus 2. The reception Data control unit 204 and the transmission Data control unit 206 are blocks for executing each function of a mac (medium Access control) layer, an rlc (radio Link control) layer, and a pdcp (packet Data conversion protocol) layer, which manage a Data Link layer.

The base station apparatus 2 may be configured as follows: in order to support transmission/reception processing performed in the same subframe of a plurality of frequencies (frequency bands, frequency bandwidths) or cells obtained by carrier aggregation or the like, a plurality of blocks of a reception system (a reception unit 201, a demodulation unit 202, and a decoding unit 203) and a part or all of blocks of a transmission system (an encoding unit 207, a modulation unit 208, and a transmission unit 209) are provided.

The radio resource controller 210 outputs the downlink data and the downlink control data to the transmission data controller 206. When there is a MAC control element to be transmitted to the terminal device 1, the transmission data control unit 206 outputs the MAC control element and each data (downlink data or downlink control data) to the encoding unit 207. The encoding unit 207 encodes the inputted MAC control element and each data, and outputs the encoded MAC control element and each data to the modulation unit 208. The modulation unit 208 modulates the encoded signal.

Further, the radio resource control section 210 may operate as follows: for the purpose of measurement set for reporting, information indicating acquisition of system information related to the sidelink direct connection discovery is included in the measurement setting message for the terminal device 1. Further, the radio resource controller 210 may operate as follows: the physical cell identifier of the cell for which the system information related to the sidelink direct connection discovery is acquired is included in the measurement setting message for the terminal device 1 as information to be measured.

The signal modulated by the modulation unit 208 is input to the transmission unit 209. The transmitter 209 maps the input signal to the frequency domain, converts the frequency domain signal into a time domain signal, carries the signal on a carrier of a predetermined frequency, amplifies the power of the signal, and transmits the signal. Typically, the physical downlink shared channel configured with the downlink control data constitutes a third layer message (RRC message).

The receiving unit 201 also converts the signal received from the terminal device 1 into a digital signal of a baseband. When a plurality of cells with different transmission timings are set for the terminal apparatus 1, the reception unit 201 receives signals at different timings for each cell (or for each cell group or TA group). The digital signal converted by the receiving unit 201 is input to the demodulating unit 202 and demodulated. The signal demodulated by the demodulation section 202 is continuously input to the decoding section 203. The decoding unit 203 decodes the input signal, and outputs each decoded data (uplink data and uplink control data) to the reception data control unit 204. The MAC control element transmitted from the terminal device 1 together with each data is also decoded by the decoding unit 203, and the relevant data is input to the received data control unit 204.

The received data control unit 204 performs control of the physical layer control unit 205 based on the received MAC control element, and error correction control (HARQ) of buffered and retransmitted data of each decoded data. Each data input to the received data control unit 204 is input (transferred) to the radio resource control unit 210 as necessary.

The physical layer control information required for controlling each of these blocks is information including parameter settings required for a radio communication control clock of the base station apparatus 2, which are configured by reception control information and transmission control information. The physical layer control information is set by network devices (MME, gateway device (SGW), OAM, and the like) in the upper layer and system parameters, and the radio resource control unit 210 outputs the information to the control unit 204 as necessary.

The physical layer control unit 205 outputs physical layer control information related to transmission as transmission control information to each block of the encoding unit 207, the modulation unit 208, and the transmission unit 209, and appropriately outputs physical layer control information related to reception as reception control information to each block of the reception unit 201, the demodulation unit 202, and the decoding unit 203.

The received data control information includes control information on the uplink of the terminal apparatus 1 for each of the MAC layer, the RLC layer, and the PDCP layer of the base station apparatus 2. The transmission data control information includes control information on the downlink of the terminal apparatus 1 for each of the MAC layer, the RLC layer, and the PDCP layer of the base station apparatus 2. That is, the reception data control information and the transmission data control information are set for each terminal device 1.

The network signal transceiver 211 transmits (transfers) or receives control messages or user data between the base station apparatuses 2 or between an upper network apparatus (MME, SGW) and the base station apparatus 2.

In fig. 2, the components of the other base station apparatus 2 and the transmission path of data (control information) between the components are omitted, but it is obvious that a plurality of blocks having other functions necessary for operating the base station apparatus 2 are provided as the components. For example, a Radio Resource Management (Radio Resource Management) section and an application layer section exist in an upper layer of the Radio Resource control section 210.

Next, an example of a procedure for monitoring the side link direct connection discovery advertisement by the terminal apparatus 1 will be described with reference to fig. 3.

In fig. 3, the terminal apparatus 1 transmits Sidelink UE Information to the base station apparatus 2 by an instruction from an upper layer or the like (step S301). The side link terminal information contains one or more of the following information: a frequency of interest for receiving side link direct communication; frequencies of interest for sending sidelink direct communication; a sidelink direct communication destination (s)) for requesting allocation of dedicated resources to the E-UTRAN; information indicative of interest in reception of the sidelink direct discovery advertisement; and the number of resources for the sidelink direct discovery announcement for requesting allocation of dedicated resources to the E-UTRAN, and the like. The sidelink terminal information may include information associated with a frequency of interest in receiving the sidelink direct discovery advertisement monitoring. For example, the sidelink terminal information may include the following: information on the frequencies of interest for reception monitored by sidelink direct discovery advertisements (e.g., ARFCN: Absolute radio-frequency channel number); a PLMN identifier for this frequency; and/or information indicating whether a period (interval) during which a signal in the serving cell is not received (sidelink discovery interval) is required in sidelink direct discovery advertisement monitoring (or measurement for sidelink direct discovery advertisement monitoring) at this frequency. In the case where the upper layer is set in such a manner that monitoring of the sidelink direct discovery advertisement at one or more frequencies used in the sidelink direct discovery advertisement contained in the inter-frequency discovery frequency list (if contained in the system information block type 19(SIB 19)), in the case where a sidelink discovery interval is requested to the monitoring of the sidelink direct discovery advertisement at least one frequency, the terminal apparatus 1 may include information associated with a frequency of interest in reception of the sidelink direct discovery advertisement monitoring in the sidelink terminal information. Further, alternatively, in a case where the upper layer is set so as to monitor the sidelink direct discovery advertisement by another PLMN instead, in a case where the sidelink direct discovery advertisement monitoring request sidelink discovery interval is made at least at one frequency, the terminal device 1 may include information associated with a frequency of interest in reception of the sidelink direct discovery advertisement monitoring in the sidelink terminal information. Thus, the base station apparatus 2 can determine the setting for the terminal apparatus 1 in consideration of the received information.

The transmission of the sidelink terminal information may be started (initial) as follows: the broadcast system information block type 19 in the primary cell, and the information of the frequency of monitoring for performing the sidelink direct connection discovery announcement is not included in the information related to the finally transmitted sidelink direct connection discovery; alternatively, the frequency of monitoring the sidelink direct connection discovery advertisement set in the upper layer is changed from the information related to the sidelink direct connection discovery transmitted last.

In addition, in the frequency of monitoring the side link direct discovery advertisement, when a synchronization source (synchronization source) at the time of monitoring the side link direct discovery advertisement is changed after information related to the side link direct discovery is finally transmitted, transmission of the side link terminal information can be started (initial) even when the frequency is not changed. For example, transmission may be started in the following case: the synchronization source is changed to a different cell, the synchronization source is changed from the cell to another terminal apparatus 1 which transmits SLSS, the synchronization source is changed from the other terminal apparatus 1 which transmits SLSS to another terminal apparatus 1 or cell, and the like.

Alternatively, the Information that can be determined by the base station apparatus 2 whether the gap is necessary may be notified by another RRC message (for example, terminal Capability Information).

The sidelink terminal information may include information that gives priority to either communication of the serving cell or communication of the sidelink direct discovery.

In addition, the sidelink terminal information may include not only information for monitoring sidelink direct connection discovery announcements, but also information for monitoring sidelink direct connection discovery announcements.

The base station apparatus 2 receives the sidelink terminal information from the terminal apparatus 1. The base station apparatus 2 transmits a measurement setting message to the terminal apparatus 1 (step S302). The base station apparatus 2 may transmit the measurement setting message based on the frequency information included in the side link terminal information, or may transmit the measurement setting message based on any determination.

For example, it can be set as: in the measurement setting, the frequency of side link direct connection discovery included in the side link terminal information is included as a measurement target, and the measurement report procedure is triggered when the measurement result of the adjacent cell becomes better than a predetermined value (absolute value) included in the report setting.

Further, for example, it is also possible to set: in the measurement setting, the frequency of the side link direct connection discovery included in the side link terminal information is included as a measurement target, and the measurement report procedure is triggered when the measurement result of the adjacent cell (of the frequency of the measurement target) becomes better than a predetermined value (absolute value) included in the report setting (entry condition), as a report setting. Further, it is also possible to: even when the measurement result of the neighboring cell deviates from the predetermined value (absolute value) included in the report setting (Leaving condition), the measurement report procedure can be triggered.

The terminal apparatus 1 having received the measurement setting message starts measurement based on the measurement setting (step S303), and reports the measurement result to the base station apparatus 2 according to the report condition (step S304).

The base station apparatus 2 receives the measurement report (step S305). The base station apparatus 2 may instruct the terminal apparatus 1 to perform further measurement or instruct handover in consideration of whether or not it is necessary to detect physical cell identifier information of a cell at a frequency of the sidelink direct discovery included in the measurement report, an interval for the sidelink direct discovery in the frequency, and the like.

The base station apparatus 2 performs setting of measurement for acquiring system information (information related to the sidelink direct connection discovery) broadcast by a cell detected in the frequency of the sidelink direct connection discovery for the terminal apparatus 1 (step S306). In this case, the following may be set: the measurement target of the measurement setting includes the frequency of the sidelink direct connection discovery and the physical cell identifier of the target cell, and the periodic measurement in the report setting is set as a trigger type to acquire the system information related to the sidelink direct connection discovery and set as the measurement target. In addition, only one measurement identifier can be set at most for the measurement purpose, in which the system information related to the acquisition of the sidelink direct connection discovery is set.

The terminal device 1 that has received the measurement setting replaces each measurement identifier included in the received measurement identifier addition change list with the received value if there is an entry that is the same as the measurement identifier of the measurement setting stored in the terminal device 1. Otherwise, it is added as a new entry to the measurement setting held in the terminal apparatus 1.

When an entry of the measurement report corresponding to each measurement identifier is stored, the entry is deleted.

Then, if a timer for periodic reporting (for example, a timer (T321) used when acquiring the cell global identifier, a timer (T322) used when acquiring system information related to the sidelink direct discovery, which will be described later, or the like) is stopped during the counting process, the information associated with the measurement identifier is reset.

Then, in the report setting corresponding to the measurement identifier, the periodic measurement is set to the trigger type, and when the measurement is for the purpose of acquiring system information related to the side link direct connection discovery, the timer (T322) is started at a predetermined value for the measurement identifier.

The terminal device 1 measures each measurement identifier as follows. In the report setting corresponding to the measurement identifier, when the measurement is performed for the purpose of acquiring system information related to the side link direct connection discovery, the terminal device 1 performs measurement using an Autonomous interval (Autonomous gap) if necessary at a frequency indicated by a corresponding measurement target. The terminal apparatus 1 may attempt to obtain system information (global cell ID, discovery reception resource pool, discovery setting, and/or the like) related to the sidelink direct discovery of the cell indicated by the first parameter (cell information for monitoring the sidelink direct discovery) included in the measurement setting. In contrast, the terminal apparatus 1 performs cell selection at a frequency included in the measurement setting associated with the cell selection, and may attempt to obtain system information related to the sidelink direct connection discovery from the selected cell. It should be noted that the period of the autonomous interval may be set by the value of the timer (T322). The terminal apparatus 1 may use available idle periods in the measurement. The terminal device 1 may instead not use the available idle periods in the measurement.

Alternatively, in the report setting corresponding to the measurement identifier, when the measurement purpose is to acquire a cell global identifier and the report setting includes an acquisition request of system information related to the sidelink direct connection discovery, the terminal device 1 may perform measurement using an Autonomous interval (Autonomous gap) if necessary at a frequency indicated by a corresponding measurement target. Also, the terminal device 1 may attempt to obtain system information of the cell related to the sidelink direct discovery. It should be noted that the period of the autonomous interval may be set by the value of the timer (T321). The terminal apparatus 1 may use available idle periods in the measurement. The terminal device 1 may instead not use the available idle periods in the measurement.

The terminal apparatus 1 can set (judge) as: when the associated report setting is such that a report related to monitoring of the sidelink direct connection discovery report is set as a measurement target, each measurement identifier is detected at an associated frequency, and any adjacent cell (any neighbor cell) having a physical cell identifier that matches a value indicated by the first parameter included in the corresponding measurement target is included in the measurement report (applicable).

When the system information related to the sidelink direct connection discovery can be acquired during the timing of the predetermined timer (T322 or T321) or when the timing of the predetermined timer has ended, a measurement report procedure is triggered (step S307). Furthermore, the measurement report procedure may be triggered by other conditions based on other report settings. The timer (T322) starts the measurement when a measurement target is set to include a report setting for acquiring system information related to the side link direct connection discovery in the measurement setting set in the terminal device 1, and stops the measurement when all system information related to the side link direct connection discovery necessary for the report is acquired. When the measurement by the timer is terminated, the measurement report program may be started, the associated measurement may be stopped, and the corresponding measurement setting identifier may be deleted. For convenience of explanation, the timer (T322) will be referred to as the name of the timer, but other names do not affect the operation of the terminal apparatus 1 and the base station apparatus 2 according to the present embodiment.

The terminal device 1 may be configured to: when the measurement report procedure is triggered, the measurement result (received power and received quality) of the serving cell (PCell) is included in the measurement report, when there is at least one applicable neighbor cell to be reported, the best neighbor cell is included in the measurement results of the neighbor cells, until the maximum number of size domains is reached, the assay is aimed at reporting on the monitoring of side-link direct discovery publications, when Cell Global Identifier (CGI) information is obtained for a cell indicated by a physical cell identifier (first parameter) notified from a base station apparatus in an associated measurement object, in case the cell broadcasts setting information related to monitoring of a sidelink direct discovery advertisement, setting information related to the monitoring of the acquired (acquired) sidelink direct discovery advertisement may be included in the assay report.

Further, the terminal device 1 may be configured to: when the first parameter is not included in the report setting, the measurement report includes setting information on monitoring of the sidelink direct notification, which is successfully acquired (obtained) by any cell detected in the frequency indicated by the measurement target bound to the measurement identifier.

The measurement result may include time offset information (system frame number (SFN) and/or subframe offset information) between the serving cell (primary cell (PCell) or secondary cell (SCell)) and the measured cell.

Further, the terminal device 1 may be configured to: when the report setting is to set the report on the monitoring of the side link direct connection discovery advertisement as the measurement target, the measurement report includes information that enables recognition that the system information on the monitoring of the side link direct connection discovery advertisement cannot be received in the measurement target cell and that the whole or part of the information on the monitoring does not exist in the system information on the side link direct connection discovery acquired in the measurement target cell.

The terminal apparatus 1 transmits a measurement report to the base station apparatus 2 (step S308), and the base station apparatus 2 receives the measurement report (step S309). The base station apparatus 2 may set a period (interval) for monitoring (or advertisement) of the sidelink direct discovery advertisement or instruct switching to the terminal apparatus 1 based on the information on the sidelink direct discovery contained in the measurement report.

The terminal device 1, which has been set in an upper layer so as to monitor the sidelink direct connection discovery advertisement and has the capability of sidelink direct connection discovery, prioritizes frequencies included in the inter-frequency discovery frequency list included in the SIB19 for each frequency set so as to monitor the sidelink direct connection discovery advertisement by the terminal device 1, and performs the following processing. If the monitoring of the sidelink direct discovery advertisement at the frequency does not affect (e.g., is in an idle period or is received by using a spare receiver) the normal process, or if the sidelink discovery interval is set at the frequency, the lower layer is set using the resource pool indicated by the discovery reception resource pool of the SIB19, so as to monitor the sidelink direct discovery advertisement (e.g., monitored by the terminal device 1) (step S310).

The above-described process is merely an example of the process, and all steps need not be performed.

For example, when the base station apparatus 2 receives the sidelink terminal information from the terminal apparatus 1, if the necessary measurement has already been set for the terminal apparatus 1, the process of step S302 is not necessary.

For example, the base station apparatus 2 may directly perform the process of step S305 without performing the processes of steps S302 to S304 based on the side link terminal information of step S301. In this case, for example, the base station apparatus 2 may set a predetermined value as the physical cell identifier of the cell to be measured in the measurement target set for measurement, or may not set the physical cell identifier of the cell to be measured. In the latter case, the terminal device 1 can acquire information on the side link direct connection discovery of an arbitrary cell detected at the frequency of the measurement target.

The terminal apparatus 1 according to the present embodiment can notify the base station apparatus 2 whether or not an interval is required for measurement for monitoring the side link direct connection discovery announcement. Further, the terminal apparatus 1 can receive measurement setting for acquiring system information for monitoring the side link direct connection discovery advertisement from the base station apparatus 2. Further, the terminal apparatus 1 can include system information related to the monitoring of the side link direct connection discovery advertisement in the measurement report and notify the base station apparatus 2 of the system information. Thereby, the terminal device 1 can perform efficient side link direct connection discovery advertisement monitoring based on the terminal capability of the terminal device 1.

The base station apparatus 2 according to the present embodiment can receive, from the terminal apparatus 1, whether or not an interval is required for measurement for monitoring the side link direct connection discovery announcement. Further, the base station apparatus 2 can notify the terminal apparatus 1 of measurement settings for acquiring system information related to the monitoring of the side link direct connection discovery advertisement. Further, the base station apparatus 2 can acquire system information related to the monitoring of the side link direct discovery announcement of another cell measured by the terminal apparatus 1. Thus, the base station apparatus 2 can perform efficient scheduling in consideration of the side link direct connection discovery announcement monitoring of the terminal apparatus 1.

< second embodiment >

A second embodiment of the present invention will be described below.

In the first embodiment, a process of acquiring system information related to sidelink direct discovery advertisement monitoring from other cells is described. In the present embodiment, an example of processing performed when SLSS transmitted from another terminal apparatus 1 is detected in frequency measurement for performing side link direct connection discovery announcement monitoring will be described.

The terminal apparatus 1 and the base station apparatus 2 used in the present embodiment are the same as those in the first embodiment, and therefore detailed description thereof is omitted.

Note that the procedure for monitoring the side link direct connection discovery advertisement by the terminal device 1 is also the same as that described with reference to fig. 3 in the first embodiment, and therefore, a detailed description thereof is omitted.

In step S303 of fig. 3, the terminal apparatus 1 that received the SLSS transmitted by the other terminal apparatus 1 may notify the base station apparatus 2 of the SLSS ID. For example, the information related to the monitoring of the sidelink direct connection discovery advertisement used when the SLSS ID and/or the SLSS is set as the synchronization source is included in the sidelink terminal information and notified. The information related to the monitoring of the sidelink direct connection discovery announcement may be, for example, information preset in the terminal device 1, or may be broadcast from the terminal device 1 that transmits the SLSS. Alternatively, the measurement report may be included in the measurement report, or may be notified by another RRC message. Thus, even when the synchronization source of the side link direct discovery is the terminal apparatus 1, the base station apparatus 2 can set an interval for monitoring in the terminal apparatus 1, and thus can give the terminal apparatus 1 an opportunity to monitor the side link direct discovery advertisement.

Alternatively, when the synchronization source does not notify the SLSS ID but changes, the transmission of the sidelink terminal information of the first embodiment may be triggered. Thereby, the base station apparatus 2 can grasp the change in the reception state in the frequency found by the side link direct connection of the terminal apparatus 1.

Further, in step S307 of fig. 3, the SLSS ID may be notified to the base station apparatus 2 upon receiving the SLSS transmitted by the other terminal apparatus 1. For example, the measurement report is notified to the base station apparatus 2 including the SLSS ID and/or information on the side link direct discovery report monitoring used when the SLSS is set as the synchronization source. The information related to the monitoring of the sidelink direct connection discovery announcement may be, for example, information preset in the terminal device 1, or may be broadcast from the terminal device 1 that transmits the SLSS. Thus, even when the synchronization source of the side link direct discovery is the terminal apparatus 1, the base station apparatus 2 can set an interval for monitoring in the terminal apparatus 1, and thus can give the terminal apparatus 1 an opportunity to monitor the side link direct discovery advertisement.

In each of the above embodiments, the system information related to the sidelink direct connection discovery may be information included in the system information block type 19 as existing system information, or may use a newly prepared system information block. Also, the system information related to the sidelink direct communication may be information included in the system information block type 18 as existing system information, or may use a newly prepared system information block.

The embodiments described above are merely examples, and can be implemented using various modifications and substitutions. For example, the uplink transmission scheme is applicable to any communication system of an FDD (frequency division duplex) scheme and a TDD (time division duplex) scheme. Note that the names of the parameters and events shown in the embodiments are referred to for convenience of description, and even if the actual application name is different from the name of the embodiment of the present invention, the gist of the invention claimed in the embodiment of the present invention is not affected.

In addition, the entity (entity) used in each embodiment may be regarded as synonymous with the sublayer (sublayer). That is, the RRC entity, PDCP entity, RLC entity, and MAC entity may be replaced with the RRC sublayer, PDCP sublayer, RLC sublayer, and MAC sublayer, respectively, for explanation.

The term "connected" used in the embodiments is not limited to a configuration in which a certain device and another certain device are directly connected by using a physical line, and includes a configuration in which a logical connection is made and a configuration in which wireless connection is made by using the same or different wireless technologies.

Note that the description using specific numerical values is merely an example of numerical values used for convenience of description, and any appropriate value may be applied.

The terminal device 1 includes not only a portable or mobile station device but also: fixed or non-movable electronic devices installed indoors and outdoors (e.g., AV devices, kitchen devices, cleaning and washing devices, air conditioning devices, office devices, vending machines, other living devices, measurement devices, and in-vehicle devices), and devices equipped with a communication function, such as wearable devices and health care devices. Further, the terminal device 1 can be used not only for person-to-person or person-to-device Communication but also for device-to-device Communication (Machine Type Communication), vehicle-to-person, vehicle-to-vehicle, road surface building-to-vehicle (road-to-vehicle) Communication.

The terminal apparatus 1 may also be referred to as a user terminal, a mobile station apparatus, a communication terminal, a mobile device, a terminal, a ue (user equipment), and a ms (mobile station). The base station device 2 may also be referred to as a radio base station device, a base station, a radio base station, a fixed station, nb (nodeb), enb (evolved nodeb), bts (base Transceiver station), and bs (base station).

The base station apparatus 2 is referred to as NB in UMTS defined by 3GPP, and is referred to as eNB in EUTRA and Advanced EUTRA. The terminal apparatus 1 in UMTS, EUTRA, and Advanced EUTRA specified by 3GPP is referred to as UE.

Further, for convenience of explanation, the methods, means, or algorithm steps for realizing the functions of the respective parts of the terminal apparatus 1 and the base station apparatus 2 or a part of the functions are specifically combined and described using functional block diagrams, but they may be directly embodied by hardware, software modules executed by a processor, or a combination thereof.

If the terminal apparatus 1 and the base station apparatus 2 are mounted by hardware, the terminal apparatus 1 and the base station apparatus 2 may be configured by a combination of a power supply device for supplying power to the terminal apparatus 1 and the base station apparatus 2, a display device such as a battery or a liquid crystal, a display driving device, a memory, an input/output interface, an input/output terminal, a speaker, and other peripheral devices, in addition to the configuration of the block diagram described above.

If installed in software, its functions may be stored or transmitted as one or more commands or code on a computer-readable medium. The computer readable medium comprises: a communication medium and a computer recording medium which are favorable for a medium for carrying a computer program from a certain place to another place.

Then, the terminal apparatus 1 and the base station apparatus 2 may be controlled by recording one or more commands or codes in a computer-readable recording medium, and reading the one or more commands or codes recorded in the recording medium into a computer system to execute the commands or codes. Note that the "computer system" referred to herein means a computer system including hardware such as an OS and peripheral devices.

The operations described in the embodiments of the present invention may be implemented by a program. The program that operates in the terminal device 1 and the base station device 2 according to each embodiment of the present invention is a program (a program that causes a computer to function) that controls a CPU or the like so as to realize the functions of the above-described embodiments according to each embodiment of the present invention. Then, information processed by these devices is temporarily stored in the RAM when the processing is performed, and then stored in various ROMs and HDDs, and read, corrected, and written by the CPU as necessary.

Further, not only the functions of the above embodiments are realized by executing a program, but also the functions of the embodiments of the present invention may be realized by commonly processing a work system or another application program based on an instruction of the program.

The "computer-readable recording medium" refers to a semiconductor medium (e.g., RAM, nonvolatile memory card, or the like), a removable medium such as an optical recording medium (e.g., DVD, MO, MD, CD, BD, or the like), a magnetic recording medium (e.g., magnetic tape, flexible disk, or the like), or a storage device such as a magnetic disk unit built in a computer system. Also, the "computer-readable recording medium" may include: a medium that dynamically stores a program in a short time, such as a communication line when the program is transmitted via a network such as the internet or a communication line such as a telephone line; a medium that stores a program for a fixed time, such as a volatile memory in a computer system serving as a server or a client in this case.

The program may be a program for realizing a part of the above-described functions, or may be a program capable of realizing the above-described functions in combination with a program already recorded in a computer system.

The functional blocks or features of the terminal device 1 and the base station device 2 used in the above embodiments may be installed or executed by a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an arbitrary Integrated Circuit (IC) for general use, a field programmable gate array signal (FPGA), other programmable logic elements, discrete gate or transistor logic, discrete hardware components, or a combination thereof, which is designed to execute the functions described in the present specification.

Note that, a part or all of the functional blocks or features of the terminal apparatus 1 and the base station apparatus 2 according to the above-described embodiments may be implemented (executed) as a circuit designed to be able to exhibit at least the functions described in the present specification, typically, an LSI which is an integrated circuit, or may be implemented (executed) as a chipset. The chip set may include other components such as an antenna and a passive element. Each functional block of the terminal apparatus 1 and the base station apparatus 2 may be formed into a chip individually, or may be formed into a chip by integrating a part or all of them. The method of integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when a technique for realizing an integrated circuit that replaces an LSI appears due to the advancement of semiconductor technology, an integrated circuit based on the technique may be used.

A general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional type of processor, controller, microcontroller, or state machine. The general-purpose processor or each of the circuits described above may be configured by a digital circuit, may be configured by an analog circuit, or may include both of them.

Further, the processor may be installed as a component that combines the computing elements. For example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or other such configuration may be used.

(conclusion)

The terminal device according to the embodiment of the present invention attempts to acquire setting information on monitoring of a sidelink direct connection discovery advertisement for a cell indicated by a first parameter by acquiring system information broadcast by the cell by measuring each set measurement identifier at a frequency indicated by a measurement target bound to the measurement identifier using an autonomous interval when a measurement purpose included in the associated report setting is a report on monitoring of the sidelink direct connection discovery advertisement and when the report setting includes the first parameter.

In addition, in the terminal device according to the embodiment of the present invention, when the first parameter is not included in the report setting, the terminal device performs measurement at a frequency indicated by a measurement target bound to the measurement identifier using an autonomous interval, and attempts to acquire setting information related to monitoring of a sidelink direct discovery advertisement of a cell detected at the frequency by acquiring system information broadcasted by the cell.

Further, the base station apparatus according to the embodiment of the present invention sets a report related to monitoring of the sidelink direct connection discovery advertisement to a measurement identifier set in the terminal apparatus as a measurement object included in the associated report setting, and includes a first parameter in the report setting, so that the terminal apparatus performs measurement at a frequency indicated by a measurement target bound to the measurement identifier using an autonomous interval, and acquires setting information related to monitoring of the sidelink direct connection discovery advertisement of a cell indicated by the first parameter from system information broadcasted from the cell.

Further, in the communication system according to the embodiment of the present invention, the base station apparatus sets a report related to monitoring of the sidelink direct connection discovery advertisement as a measurement purpose included in the associated report setting for a measurement identifier set in the terminal apparatus, and includes a first parameter in the report setting, the measurement purpose included in the associated report setting by the terminal apparatus is a report related to monitoring of the sidelink direct connection discovery advertisement, and when the first parameter is included in the report setting, measures each set measurement identifier at a frequency indicated by a measurement object bound to the measurement identifier using an autonomous interval, and attempts to acquire setting information related to monitoring of the sidelink direct connection discovery advertisement for a cell indicated by the first parameter by acquiring system information broadcasted by the cell.

In addition, a method for measuring a terminal device according to an embodiment of the present invention includes at least the steps of: a step of measuring each set measurement identifier using the autonomous interval and a frequency indicated by a measurement target bound to the measurement identifier, when a measurement purpose included in the associated report setting is a report related to monitoring of the sidelink direct connection discovery report and the report setting includes the first parameter; and attempting to acquire setting information of the cell indicated by the first parameter, which is related to monitoring of the sidelink direct discovery advertisement, by acquiring system information broadcast by the cell.

Further, the integrated circuit mounted on the terminal device according to the embodiment of the present invention causes the terminal device to function as: a function of measuring each set measurement identifier at a frequency indicated by a measurement target bound to the measurement identifier using an autonomous interval when a measurement purpose included in the associated report setting is a report related to monitoring of a sidelink direct connection discovery report and the report setting includes a first parameter; and a function of attempting to acquire setting information related to monitoring of a sidelink direct discovery advertisement of a cell represented by the first parameter by acquiring system information broadcast by the cell.

While the embodiments of the present invention have been described in detail based on the specific examples, it is obvious that the gist of each embodiment of the present invention and the scope of claims are not limited to these specific examples, and design changes and the like that do not depart from the gist of the present invention are also included. That is, the content of the present specification is for illustrative purposes only and does not limit the embodiments of the present invention at all.

The present invention can be variously modified within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the respective different embodiments are also included in the technical scope of the present invention. Further, a configuration in which elements having similar effects to those described in the above embodiments are replaced with each other is also included in the technical scope of the present invention.

(cross-reference to related applications)

This application claims priority to japanese patent application No. 2015-156694, filed on 7/8/2015, the entire contents of which are incorporated herein by reference.

Description of the symbols

1 … terminal device

2. 2-1, 2-2 … base station device

101. 201 … receiving part

102. 202 … demodulation unit

103. 203 … decoding part

104. 204 … received data control part

105. 205 … physical layer control part

106. 206 … Transmission data control part

107. 207 … encoding part

108. 208 … modulating part

109. 209 … transmission unit

110. 210 … radio resource control unit

111 … measurement unit

211 … network signal receiving and transmitting part

Claims (4)

1. A terminal device, comprising:

a reception unit that receives, from a base station apparatus, a message including a first setting relating to sidelink direct connection discovery, that is, a message including frequency information in the first setting, using a dedicated control channel DCCH in a state in which a radio connection with the base station apparatus is established in a visited cell of a first frequency; and

a control part for starting a timer with a preset value,

the receiving section is configured to attempt to acquire system information broadcasted in a peripheral cell of a second frequency indicated by the frequency information, that is, system information related to monitoring of a sidelink direct connection discovery advertisement, in the operation of the timer,

a transmission unit that transmits a report including the system information to the base station apparatus,

the system information includes information indicative of a reception resource pool associated with the monitoring.

2. A base station apparatus, comprising:

a transmission unit that transmits, to a terminal device, a message including a first setting relating to sidelink direct connection discovery, that is, a message including frequency information in the first setting, in a state in which a radio connection with the terminal device is established in an access cell of a first frequency, using a dedicated control channel DCCH; and

a receiving unit that receives a report including system information related to monitoring of the side link direct connection discovery,

the system information is information which is broadcasted by the terminal device in a neighboring cell of a second frequency indicated by the frequency information and is received by the terminal device in an operation of the timer after the timer in which a predetermined value is set is started by the terminal device,

the system information includes information indicative of a reception resource pool associated with the monitoring.

3. A measurement method applied to a terminal device, comprising at least the steps of:

a step in which a receiving unit receives, from a base station apparatus, a message including a first setting relating to sidelink direct connection discovery, that is, a message including frequency information in the first setting, using a dedicated control channel DCCH in a state in which a radio connection with the base station apparatus is established in a visited cell of a first frequency;

a step in which the setting unit starts setting a timer of a predetermined value; and

the reception unit attempts acquisition of system information broadcast in a neighboring cell of a second frequency indicated by the frequency information, that is, system information related to monitoring of a sidelink direct connection discovery advertisement, during operation of the timer,

a step of transmitting a report including the system information to the base station apparatus,

the system information includes information indicative of a reception resource pool associated with the monitoring.

4. An integrated circuit mounted on a terminal device, comprising one or more chips for causing the terminal device to function as:

a function of receiving, from a base station apparatus, a message including a first setting relating to sidelink direct connection discovery, that is, a message including frequency information in the first setting, using a dedicated control channel DCCH in a state in which a wireless connection with the base station apparatus is established in a visited cell of a first frequency;

starting a function of a timer in which a predetermined value is set; and

a function of attempting to acquire system information broadcasted in a peripheral cell of a second frequency indicated by the frequency information, that is, system information related to monitoring of a sidelink direct discovery advertisement, in the action of the timer,

a function of transmitting a report containing the system information to the base station apparatus,

the system information includes information indicative of a reception resource pool associated with the monitoring.

Images